如何使用kotlin dsl配置影子插件

Question

我不知道如何在带有kotlin DSL的gradle构建中使用shadow插件。所有文档都使用groovy dsl。

这是build.gradle.kts的内容：

import groovy.lang.GroovyObject
import org.gradle.jvm.tasks.Jar

plugins {
    // Apply the Kotlin JVM plugin to add support for Kotlin.
    id("org.jetbrains.kotlin.jvm") version "1.4.10"

    id("com.github.johnrengelman.shadow") version "6.1.0"
    application
}

allprojects {
    repositories {
        // Use jcenter for resolving dependencies.
        // You can declare any Maven/Ivy/file repository here.
        jcenter()
    }
    group = "com.example"
    version = "1.0-SNAPSHOT"
}

dependencies {
    // Align versions of all Kotlin components
    implementation(platform("org.jetbrains.kotlin:kotlin-bom"))

    // Use the Kotlin JDK 8 standard library.
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
}

application {
    mainClass.set("com.example.MainKt")
}


tasks.withType<Jar> {
    manifest {
        attributes(
                mapOf(
                    "ImplementationTitle" to project.name,
                    "Implementation-Version" to project.version)
        )
    }
}

这是src/main/kotlin/com/example/main.kt的内容

package com.example

fun main() {
    println("Hello world")
}

但是当我尝试进行 gradle 构建时，我收到此错误：

A problem was found with the configuration of task ':shadowJar' (type 'ShadowJar').
> No value has been specified for property 'mainClassName'.

我认为这很奇怪，因为我已经在Application参数中输入了应用程序主类。

我试着加上这个:

tasks.withType<ShadowJar>() {
    mainClassName = "com.example.MainKt"
}

但是当我尝试使用此选项构建时，它抱怨它找不到ShadowJar类型。

  Line 22: tasks.withType<ShadowJar>() {
                          ^ Unresolved reference: ShadowJar

我到底做错了什么？

Answer 1

我建议在您的简单情况下配置默认的< code>shadowJar和< code>jar任务(不是所有< code>ShadowJar和< code>Jar类型的任务，因为您没有创建其他实例)。

kotlin prettyprint-override">tasks {
    jar {
        manifest {
            attributes(
                mapOf(
                    "Main-Class" to "com.example.MainKt", //will make your jar (produced by jar task) runnable 
                    "ImplementationTitle" to project.name,
                    "Implementation-Version" to project.version)
            )
        }
    }
    shadowJar {
        manifest.inheritFrom(jar.get().manifest) //will make your shadowJar (produced by jar task) runnable
    }
}

application {
    mainClassName = "com.example.MainKt" //will make run & runShadow tasks work. Have no idea why it can't take main class from jar/shadowJar manifests
}

Answer 2

问题是我试图将＜code＞mainClassName

application {
    val name = "com.cognite.ingestionservice.MainKt"
    mainClass.set(name)

    // Required by ShadowJar.
    mainClassName = name
}

mainClassName 属性已弃用，但从 6.1.0 版开始，ShadowJar 仍然需要它。

main类。set（）在添加＜code＞mainClassName